That is the least I can do for her. Given her age, the hazy weather can do harm if she take it too lightly.
I would say this DP04 is much quieter than the TP00 (1st gen purifier fan which I have been using since late 2015). It come with 2 types of filters, 1 activated carbon filter pack (with solid carbon granular instead of carbon coated filter mesh) and 1 glass HEPA filter (good for up to 0.1 micron particles - PM0.1).
Wind power wise, it is more suitable for desktop and room use, than replacing traditional standing fan (although the rated area of coverage is up to 430 ft2). Noise level, I would say it is now comparable with traditional air purifier from say Sharp, Panasonic, Novita, and much quieter than higher power unit from Honeywell.

This stall at the food court within Giant Tampines. Portion is quite sizeable but the meat balls (with juicy filling) are nothing special to me, probably I had tried better one elsewhere.
As for the purifier, very limited stock island wide, but I still manage to get it (and with 10% off offer price some more).😮
And grab these from Giant for today breakfast.

Manage to get this for my mum this evening. All stores machiam fish market, everyone just grab without asking for discount, only I did (and also lucky to get the last set). 😅
Nett price @$449.10, not a bad deal in times when everywhere ran out of stock. 🙂

24 PSI reading breached 100 (unhealthy range) as of 4pm. Avoid strenuous outdoor activities. Stay indoor and turn on the air purifier if you have it.
Hourly readings look even worse, hitting >200 (very unhealthy range) in the Western part of the island.

Just click on the double arrow sign on the post title, and it will bring you the 1st unread post of the thread.
The same when using mobile phone
As for deleting notifications, the admin and IT team is still working on it.

I am using Android phone and face similar issues (mine sometime can delete, sometime can't). There is a work around, a little troublesome, but 100% workable (bear with it for now time the IT department come up with a better solution).
Select the tag with a few characters before and after it...
And delete the selection using backspace button (and retype the few missing characters)